yihui / knitr / 884

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Fix `current_input` with absolute input file path (#1225)

* Fix `current_input` with absolute input file path

With an absolute input file path passed to `knit`, `current_input`
yields wrong output:

* When `dir = FALSE` is specified, an absolute path is given, not just
  the filename, contrary to the function’s documentation.
* When `dir = TRUE` is specified, the current working directory path is
  prepended to the absolute file path, yielding an incorrect path.

* Formatting

* Use existing function for abspath test

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